config() {
  NEW="$1"
  OLD="$(dirname "${NEW}")/$(basename "${NEW}" .new)"
  # If there's no config file by that name, mv it over:
  if [ ! -r "${OLD}" ]; then
    mv "${NEW}" "${OLD}"
  elif [ "$(md5sum "${OLD}")" = "$(md5sum "${NEW}")" ]; then
    # toss the redundant copy
    rm "${NEW}"
  fi
  # Otherwise, we leave the .new copy for the admin to consider...
}

find etc/luarocks -name \*.new -type f |
  while IFS= read -r file; do
    config "${file}"
  done
